4yr old's speech - what's normal?

My middle Dd is 4 - almost 5yrs. She started school last September. When she was 3 I took her to the SLT service locally as she said very little and had a limited vocabulary. It was a bit pointless as she refused to speak during the 3 appointments so they couldn't assess her development. She started speaking mire of her own accord and now she's normal for her I I think, although doesn't like speaking much except at home. My concern now is her pronunciation particularly of th and v sounds. My oldest never really had these issues and I'm not sure if it's something we should be helping her with or if it's normal and she'll learn naturally to say these sounds correctly. For example she says berry not very and wiz instead of with. Any thoughts?

Th is one of the later sounds children develop and pronouncing it as d,f or v at that age is still fairly common. I think you would expect most children to pronounce the v in very correctly by this age though.

Thanks. She's so anti doing what people want her to do - the more she knows something is wanted/expected the less she'll do it that I wonder how we - her parents - or any professional would ever get her to cooperate. I guess SALT have techniques/strategies to work with this?